[GHC] #10162: Add unicode syntax for banana brackets

[GHC]

#10162: Add unicode syntax for banana brackets
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        Reporter:  zardoz            |                Owner:  JoshPrice247
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:  ⊥
       Component:  Compiler          |              Version:  7.8.4
  (Parser)                           |             Keywords:  unicode,
      Resolution:                    |  UnicodeSyntax, newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2012
       Wiki Page:                    |
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Comment (by Iceland_jack):

 Are there any plans of supporting idiom brackets? `⦇ Just 1 + Just 2 ⦈`
 could be used and Arrows are not used much at all

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10162#comment:7>
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